Страница 1 мировой engineering стандарты общая спецификация

Page 252
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
The boot software can be broken down into the following components: Power Management, System
Initialization, Message Handler, Programming Executive/Program Loader, Diagnostic Service Manager, and
Programming Routines. See Figure 36.
Figure 36: GMLAN Boot Software
9.3.2.3.1 Boot Software Power Management. 
The power management portion of the boot software handles
the wake-up mechanism supported by the ECU (if applicable). The wake-up mechanism for SWCAN ECUs is
defined in GMW3104. Dual Wire CAN (DWCAN) ECUs that support a wake-up mechanism must document the
mechanism used in the CTS.
The power management component of the boot software also interfaces with the programming executive. If the
programming executive does not detect the start of a programming event within 1 minute of the receipt of a
wake-up, then the programming executive shall inform the power management logic which in turn shall cause
the ECU to enter the low power state.
The start of a programming event is defined to be the point where the programming_mode_active flag is set to

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YES. Refer to paragraph 8.17.6.2 (service $A5 pseudo code) for additional details. Once the programming
event has started, the ECU shall remain awake until the programming event concludes (via the receipt of the
$20 service or a P3
C 
timeout). The ECU shall perform a software reset at the conclusion of the programming
event.
9.3.2.3.2 Boot Software System Initialization. 
The system initialization component of the boot software is
responsible for ECU initialization upon powerup or after a reset. Tasks of this component include (but are not
limited to) I/O initialization and determining if valid operational software and calibrations are present in the
ECU. The system initialization software shall be able to determine if the ECU has only boot software present,
boot software and operational software present, or if boot software, operational software and calibrations are
all present. The exact method used to determine if valid operational software and calibrations are present must
be documented in a CTS, GM provided bootloader specification or ECU specific diagnostic implementation
specification. If valid operational software and calibrations are present, then the system initialization
component completes its initialization and transfers control to the operational software. Otherwise, the ECU
transfers program control to the boot software programming executive or program loader.
If valid operational software and calibrations are not present, then the initialization component of the boot
software shall initialize the ECU I/O in a manner that meets the requirements specified in paragraph 9.2.
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